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Base64 is not privacy #17

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Base64 is not privacy #17

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27 changes: 17 additions & 10 deletions posts/2015-02-25-my-favorite-activesupport-features.md
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Original file line number Diff line number Diff line change
Expand Up @@ -286,19 +286,26 @@ You can use it to generate and verify signed messages

```ruby
@verifier = ActiveSupport::MessageVerifier.new('s3Krit', serializer: JSON)
@verifier.generate("private message")
#=> "InByaXZhdGUgbWVzc2FnZSI=--43fc83190b28daf8df04c0b86ff2976931a6dcd2"
@verifier.verify("InByaXZhdGUgbWVzc2FnZSI=--43fc83190b28daf8df04c0b86ff2976931a6dcd2")
#=> "private message"

@verifier.generate("a" => "private message")
#=> "eyJhIjoicHJpdmF0ZSBtZXNzYWdlIn0=--b253af3e77622f743cf6804c870f4a95cbbd6f00"
@verifier.verify("eyJhIjoicHJpdmF0ZSBtZXNzYWdlIn0=--b253af3e77622f743cf6804c870f4a95cbbd6f00")
=> {"a"=>"private message"}
@verifier.generate("signed message")
#=> "InNpZ25lZCBtZXNzYWdlIg==--e31182c43a7c13fc8d9affe8c0ed5503f79cc861"
@verifier.verify("InNpZ25lZCBtZXNzYWdlIg==--e31182c43a7c13fc8d9affe8c0ed5503f79cc861")
#=> "signed message"

@verifier.generate("a" => "signed message")
#=> "eyJhIjoic2lnbmVkIG1lc3NhZ2UifQ==--f41b7c9e79e26e528975ee3630f2ad5b8b1267d9"
@verifier.verify("eyJhIjoic2lnbmVkIG1lc3NhZ2UifQ==--f41b7c9e79e26e528975ee3630f2ad5b8b1267d9")
=> {"a"=>"signed message"}
```

Mostly obvious: it's just a signed message, not an encrypted one. You can easily look up the data after it's decoded with Base64:

```
Base64.strict_decode64("InNpZ25lZCBtZXNzYWdlIg==--e31182c43a7c13fc8d9affe8c0ed5503f79cc861".split("--").first)
#=> "\"signed message\""
```

## Summary

That's it. You can browse entire ActiveSupport codebase quickly and easily at [github](https://github.com/rails/rails/tree/master/activesupport/lib/active_support)

If you liked it, you may also enjoy [Hidden features of Ruby you may not know about](/2014/07/hidden-features-of-ruby-you-may-dont-know-about/)
If you liked it, you may also enjoy [Hidden features of Ruby you may not know about](/2014/07/hidden-features-of-ruby-you-may-dont-know-about/)