Why Does Base64 End With ==?

What encryption ends with ==?

A Base64 string will end with == if and only if the number of bytes it encodes, mod 3, equals 1.

Do you see the pattern.

It happens that 16-byte (128-bit) encryption keys are very commonly encoded in Base64, and since 16 mod 3 = 1, their encoding will end with == .

But your string, decoded, is 61 bytes (488 bits) long..

What is base64 padding?

Padding. = is the padding char. It is used to pad the string to a multiple of four. You can remove them from the final result without any issues, as a result a lot of times you see base64 encoded characters without padding.

Why do we use base64?

From wiki: “Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data. This is to ensure that the data remains intact without modification during transport”.

Is base64 a cipher?

Base64 isn’t really a cipher, since there is no key. It was originally used to encode binary information like images into a character string consisting only of printable characters so it could be sent over text protocols like http.

How long does it take to decode base64?

How fast can you decode base64 data? On a recent Intel processor, it takes roughly 2 cycles per byte (from cache) when using a fast decoder like the one from the Chrome browser. This fast decoder is basically doing table lookups.

How do I decode base64?

Wikipedia has a good expalanation of what base64 encoding and decoding involves. Load the base64 data to decode from a file, then press the ‘Decode’ button: Browse: Alternatively, type or paste in the text you want to base64–decode, then press the ‘Decode’ button.

Which is better hashing or encryption?

Encryption and hashing both help to maintain the privacy, security, and authenticity of your data. In this way, encryption offers generally the same benefits as hashing. While it’s true the best hash algorithm is probably more difficult to crack than the best encryption algorithm, encryption is necessary.

Does base64 always end in ==?

A Base64 ends with either = or == or any of the accepted Base64 digit [A-Za-z0-9+-]. The = is a padding that indicates the number of actual bytes of data in the last three bytes.

Is base64 reversible?

Base64 is not an encryption algorithm and in no case should it be used to “hash” passwords or “encrypt” sensitive data, because it is a reversible algorithm and the encoded data can be easily decoded. Base64 may only be used to encode raw result of a cryptographic function.

Is base64 safe?

Note that although Base64 is often used in cryptography is not a security mechanism. Anyone can convert the Base64 string back to its original bytes, so it should not be used as a means for protecting data, only as a format to display or store raw bytes more easily.

Is base64 image faster?

Base64 encoding will expand the image by a third, which will increase bandwidth utilization. … So, a pipe with great throughput but poor latency (such as a satellite internet connection) will likely load a page with inlined images faster than if you were using distinct image files.

How can you tell base64?

The length of a Base64-encoded string is always a multiple of 4. Only these characters are used by the encryption: “A” to “Z”, “a” to “z”, “0” to “9”, “+” and “/” The end of a string can be padded up to two times using the “=”-character (this character is allowed in the end only)