> ## Documentation Index
> Fetch the complete documentation index at: https://cofhe-docs.fhenix.zone/llms.txt
> Use this file to discover all available pages before exploring further.

# Access Control

> allow, allowPublic, allowThis, allowSender, allowTransient, isAllowed, isPubliclyAllowed

All access control functions work on `ebool | euint8 | euint16 | euint32 | euint64 | euint128 | eaddress`.

***

### allow

Grants permission to a specific address.

```solidity theme={null}
FHE.allow(encryptedValue, userAddress);
```

### allowThis

Grants permission to the current contract (`address(this)`).

<Tip>
  Call `allowThis` after modifying encrypted state variables so the contract can use them in future transactions.
</Tip>

```solidity theme={null}
euint32 counter = FHE.add(counter, FHE.asEuint32(1));
FHE.allowThis(counter);
```

### allowPublic

Grants public permission — anyone can request decryption off-chain via `decryptForTx` without a permit.

<Warning>
  Once called, the value can be decrypted by anyone. Only use this when you intend to reveal the value publicly (e.g., after an auction closes or when unwrapping tokens).
</Warning>

```solidity theme={null}
FHE.allowPublic(highestBid);
```

### allowSender

Grants permission to `msg.sender`.

```solidity theme={null}
FHE.allowSender(encryptedValue);
```

### allowTransient

Grants temporary permission to a specific address for the current transaction only.

```solidity theme={null}
FHE.allowTransient(encryptedValue, otherContract);
```

***

### isAllowed

Checks if an address has permission.

```solidity theme={null}
bool hasAccess = FHE.isAllowed(encryptedValue, userAddress);
```

### isPubliclyAllowed

Checks if the value has been granted public access via `allowPublic`.

```solidity theme={null}
bool isPublic = FHE.isPubliclyAllowed(encryptedValue);
```